/*************************************************************************
 *
 *  File Name (AccessibleRelation.idl)
 * 
 *  IAccessible2 IDL Specification 
 * 
 *  Copyright (c) 2007, 2013 Linux Foundation 
 *  Copyright (c) 2006 IBM Corporation 
 *  Copyright (c) 2000, 2006 Sun Microsystems, Inc. 
 *  All rights reserved. 
 *   
 *   
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions 
 *  are met: 
 *   
 *   1. Redistributions of source code must retain the above copyright 
 *      notice, this list of conditions and the following disclaimer. 
 *   
 *   2. Redistributions in binary form must reproduce the above 
 *      copyright notice, this list of conditions and the following 
 *      disclaimer in the documentation and/or other materials 
 *      provided with the distribution. 
 *
 *   3. Neither the name of the Linux Foundation nor the names of its 
 *      contributors may be used to endorse or promote products 
 *      derived from this software without specific prior written 
 *      permission. 
 *   
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 *  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 *  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 *  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 *   
 *  This BSD License conforms to the Open Source Initiative "Simplified 
 *  BSD License" as published at: 
 *  http://www.opensource.org/licenses/bsd-license.php 
 *   
 *  IAccessible2 is a trademark of the Linux Foundation. The IAccessible2 
 *  mark may be used in accordance with the Linux Foundation Trademark 
 *  Policy to indicate compliance with the IAccessible2 specification. 
 * 
 ************************************************************************/ 

import "objidl.idl";
import "oaidl.idl";
import "oleacc.idl";

/** @defgroup grpRelations Relations 
  Use the following constants to compare against the BSTRs returned by 
  IAccessibleRelation::relationType.
*/ 
///@{

/** The target object is the containing application object. */
const WCHAR *const IA2_RELATION_CONTAINING_APPLICATION = L"containingApplication";

/** The target object is the containing document object. The target object implements
 the IAccessibleDocument interface.
*/
const WCHAR *const IA2_RELATION_CONTAINING_DOCUMENT = L"containingDocument";

/** The target object is the containing tab pane object. */
const WCHAR *const IA2_RELATION_CONTAINING_TAB_PANE = L"containingTabPane";

/** The target object is the containing window object. */
const WCHAR *const IA2_RELATION_CONTAINING_WINDOW = L"containingWindow";

/** Some attribute of this object is affected by a target object. */
const WCHAR *const IA2_RELATION_CONTROLLED_BY = L"controlledBy";

/** This object is interactive and controls some attribute of a target object. */
const WCHAR *const IA2_RELATION_CONTROLLER_FOR = L"controllerFor";

/** This object is described by the target object. */
const WCHAR *const IA2_RELATION_DESCRIBED_BY = L"describedBy";

/** This object is describes the target object. */
const WCHAR *const IA2_RELATION_DESCRIPTION_FOR = L"descriptionFor";

/** This object is embedded by a target object. */
const WCHAR *const IA2_RELATION_EMBEDDED_BY = L"embeddedBy";

/** This object embeds a target object. This relation can be used on the
 OBJID_CLIENT accessible for a top level window to show where the content 
 areas are.
*/
const WCHAR *const IA2_RELATION_EMBEDS = L"embeds";

/** Content flows to this object from a target object. 
 This relation and IA2_RELATION_FLOWS_TO are useful to tie text and non-text
 objects together in order to allow assistive technology to follow the
 intended reading order.
*/
const WCHAR *const IA2_RELATION_FLOWS_FROM = L"flowsFrom";

/** Content flows from this object to a target object. */
const WCHAR *const IA2_RELATION_FLOWS_TO = L"flowsTo";

/** This object is label for a target object. */
const WCHAR *const IA2_RELATION_LABEL_FOR = L"labelFor";

/** This object is labelled by a target object. Note that the double L spelling
 which follows is preferred.  Please use it instead.  This single L version may
 be removed in a later version.
*/
const WCHAR *const IA2_RELATION_LABELED_BY = L"labelledBy";

/** This object is labelled by a target object. */
const WCHAR *const IA2_RELATION_LABELLED_BY = L"labelledBy";

/** This object is a member of a group of one or more objects. When 
 there is more than one object in the group each member may have one and the 
 same target, e.g. a grouping object.  It is also possible that each member has 
 multiple additional targets, e.g. one for every other member in the group.
*/
const WCHAR *const IA2_RELATION_MEMBER_OF = L"memberOf";

/** The target object is the next object in the tab order. */
const WCHAR *const IA2_RELATION_NEXT_TABBABLE = L"nextTabbable";

/** This object is a logical child of a target object.  This relation is the reciprocal
 of the IA2_RELATION_NODE_PARENT_OF relation. In some cases an application's accessible
 tree is such that objects can be in a logical parent-child relationship which is
 different from the hierarchy of the accessible tree. */
const WCHAR *const IA2_RELATION_NODE_CHILD_OF = L"nodeChildOf";

/** This object is a logical parent of a target object. This relation is the reciprocal
 of the IA2_RELATION_NODE_CHILD_OF relation. In some cases an application's accessible
 tree is such that objects can be in a logical parent-child relationship which is
 different from the hierarchy of the accessible tree. */
const WCHAR *const IA2_RELATION_NODE_PARENT_OF = L"nodeParentOf";

/** This object is a parent window of the target object. */
const WCHAR *const IA2_RELATION_PARENT_WINDOW_OF = L"parentWindowOf";

/** This object is a transient component related to the target object. 
 When this object is activated the target object doesn't lose focus.
*/
const WCHAR *const IA2_RELATION_POPUP_FOR = L"popupFor";

/** The target object is the previous object in the tab order. */
const WCHAR *const IA2_RELATION_PREVIOUS_TABBABLE = L"previousTabbable";

/** This object is a sub window of a target object. */
const WCHAR *const IA2_RELATION_SUBWINDOW_OF = L"subwindowOf";

///@}

/** This interface gives access to an object's set of relations.
*/
[object, uuid(7CDF86EE-C3DA-496a-BDA4-281B336E1FDC)]
interface IAccessibleRelation : IUnknown
{
  /** @brief Returns the type of the relation.
   @param [out] relationType
    The strings returned are defined @ref grpRelations "in this section of the documentation".
   @retval S_OK
  */
  [propget] HRESULT relationType
    (
     [out, retval] BSTR *relationType
    );

  /** @brief Returns a localized version of the relation type.
   @param [out] localizedRelationType
   @retval S_OK
  */
  [propget] HRESULT localizedRelationType
    (
     [out, retval] BSTR *localizedRelationType
    );

  /** @brief Returns the number of targets for this relation.
   @param [out] nTargets
   @retval S_OK
  */
  [propget] HRESULT nTargets
    (
     [out, retval] long *nTargets
    );

  /** @brief Returns one accessible relation target.
   @param [in] targetIndex
    0 based index
   @param [out] target
   @retval S_OK
   @retval E_INVALIDARG if bad [in] passed
   @note Use QueryInterface to get IAccessible2.
  */
  [propget] HRESULT target
    (
     [in] long targetIndex,
     [out, retval] IUnknown **target 
    );

  /** @brief Returns multiple accessible relation targets
   @param [in] maxTargets
    maximum size of the array allocated by the client
   @param [out] targets
    The array of target objects.  Note that this array is to be allocated by the
    client and freed when no longer needed.  Refer to @ref _arrayConsideration 
    "Special Consideration when using Arrays" for more details.  You will need to use 
    QueryInterface on the IUnknown to get the IAccessible2.
   @param [out] nTargets
    actual number of targets in the returned array (not more than maxTargets)
   @retval S_OK
   @retval E_INVALIDARG if bad [in] passed, e.g. a negative value
  */
  [propget] HRESULT targets
    (
     [in] long maxTargets, 
     [out, size_is(maxTargets), length_is(*nTargets)]
       IUnknown **targets, 
     [out, retval] long *nTargets 
    );

}
